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I believe there will be no performance boost at all.
Though, I do believe there will be savings on the battery.

Oh really? I guess Weisbecker assumed wrong then?
According to the original article it sounded like it could be both an increase in battery and performance throughput:

Originally posted by Michael

Weisbecker believes this adaptive tickless support will be of great benefit for high-performance computing, as it can optimize throughput by avoiding the overhead of the timer interrupt, and also for real-time uses with less interrupts being generated so a reduction in latency